HD 219134 Revisited: Planet d transit upper limit and planet f transit nondetection with ASTERIA and TESS

Sara Seager, Mary Knapp, Brice Olivier Demory, Akshata Krishnamurthy, Chelsea X. Huang, Mariona Badenas Agusti, Avi Shporer, Drew Weisserman, Juliette Becker, Andrew Vanderburg, Matthew Smith, Christopher M. Pong, Vanessa P. Bailey, Amanda Donner, Peter Di Pasquale, Brian Campuzano, Colin Smith, Jason Luu, Alessandra Babuscia, Robert L. BocchinoJessica Loveland, Cody Colley, Tobias Gedenk, Tejas Kulkarni, Kyle Hughes, Mary White, Joel Krajewski, Lorraine Fesq, George Ricker, Roland Vanderspek, David W. Latham, Jon M. Jenkins, Joshua N. Winn, Douglas A. Caldwell, Karen A. Collins, Diana Dragomir, Michael Fausnaugh, Ana Glidden, Joshua E. Schlieder, Joseph D. Twicken, Bill Wohler

Research output: Contribution to journalArticlepeer-review


HD 219134 is a K3V dwarf star with six reported radial-velocity discovered planets. The two innermost planets b and c show transits, raising the possibility of this system to be the nearest (6.53 pc), brightest (V = 5.57) example of a star with a compact multiple transiting planet system. Ground-based searches for transits of planets beyond b and c are not feasible because of the infrequent transits, long transit duration (~5 hr), shallow transit depths (<1%), and large transit time uncertainty (~half a day). We use the space-based telescopes the Arcsecond Space Telescope Enabling Research in Astrophysics (ASTERIA) and the Transiting Exoplanet Survey Satellite (TESS) to search for transits of planets f (P = 22.717 days and M sin i = 7.3 ± 0.04M) and d (P?=?46.859 days and M sin i = 16.7 ± 0.64MÅ). ASTERIA was a technology demonstration CubeSat with an opportunity for science in an extended program. ASTERIA observations of HD 219134 were designed to cover the 3s transit windows for planets f and d via repeated visits over many months. While TESS has much higher sensitivity and more continuous time coverage than ASTERIA, only the HD 219134 f transit window fell within the TESS survey's observations. Our TESS photometric results definitively rule out planetary transits for HD 219134 f. We do not detect the Neptune-mass HD 219134 d transits and our ASTERIA data are sensitive to planets as small as 3.6 R. We provide TESS updated transit times and periods for HD 219134 b and c, which are designated TOI 1469.01 and 1469.02 respectively.

Original languageEnglish (US)
Article number15pp
JournalAstronomical Journal
Issue number3
StatePublished - Mar 1 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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